#include <stdio.h>
    int main()
    {
        int a, b, c;
        scanf("%d %d %d",&a,&b,&c);
        if (a + b > c && a + c > b && b + c > a)
            {
              if (a == b && b == c)
                {
                    printf("Equilateral triangle!\n");
                }
                else if (a == b || b == c || a == c)
                {
                    printf("Isosceles triangle!\n");
                }
                else
                {
                    printf("Ordinary triangle!\n");
                }
            }
            else
            {
                printf("Not a triangle!\n");
            }
        
        return 0;
    }
    




